Lock



l 1,634,825 July 5 1927' Ac1. DIETRICH Loox Filed-May s, 1925 2Sheet-Sheet 2 Patented `truly 5, 1927.

eerst-ir CLAUS DIETRICH, or sr. PAUL, Minnnsej'rn.

'Y Loox.

'Application filedy May 8, 1925 Serial No. 28,813.

My invention relates to improvements in locks and isparticularly"adapted to Vthat style of lock used for safety depositboxesand the like Where' tivo keys 'are employed,

one offivhic'h the bank pass keygwhile the other is the keyr of theparty renting the safety deposit box. f f

rMyinvention includes means designed to providev a safety which is`particularly adapted'to a double barrel lock Where two keys vareemployed,it being necessary that one key'f, be inserted into' the lookbefore the other ke'y can operate. Thilo looks are designed to operatein this manner and are noivon the market,th`ese locksare not pick proofyas itispossible to insert a pick in the key-Way passage and by properlymanipulating they saniethe tumbler or operating dogs ofthe look can beraised in a rmani ner so thatthelk can be openedlby picking ittl'iroughoneA of the keycylinders and using` a key in the othercylinder. My' invention is designed to overcome thisobjeotionablefeature of present looks by a simple, inexpensivemeanswhich is readily adapted l toy the present lconstruction and formationVof locks. v v

A- further feature yof the invention' resides inY providing a safetyvplate means 3 which can be stamped out of sheet material andwhioh isadapted to fity in the present formation. of locks of thistyp'e in aman-v ner so as to cooperate Withthekeycylinders and-'the lookoperatingdogs ortumblers so that the lookean onlyfb'eoperated vby a passkey held by the fbankfandthe 'keyfof the safety f box owner', thus' lpreventing Y Aany possibility of piokingthe'lockor opening it with aknife blade, as isvpossible with certainifornis of looks now in use.

A further feature ofthe invention resides in separate 'blade means whichis positioned in the lock and tvhic'hisadapted to operate in conjunctionWith vboth of thej key lcylinders, thus making itnecessary to have a'key for the pass key of the look,l Whieh'will operate both of theplate'ineansat the same box.

is desirable to yprovide a look Which is adapted to insure thepartyrentin'g the box Locks of the kind Adescribed aref-in general usein safety deposit banks nowand' itthat it is safe againstbeing'tamperedwiththus making it necessary'tliat the keyV operate just as perfectly asthe vkey of the renter. Y

'These features, together with other peculiar formations and otherVobjects Will be more fully set forth in the specification and claims:-

in the drawings forming part of my specification; 1

VFigure l is an illustration of theY ordinary look used for safetydeposit, boxes, showing av form of my invention associated therewith,

Figure 2 is a View of a similar look illustrating a form of my inventionattached thereto, thev cover plate of the lock being removed in thisillustration.

Figure 3 isA a section on the line 3-3 of Figure 2.

Figure t Figure 2. Y Y Figure' illustrates a-detail portion of myinvention.

l Figure G is an end View of the part illustrated in Figure 5.

Figure-7 illustrates one of the key cylinders removed from the lock.- f

Figure 8 illustrates another of the key cylinders removed from the lock.

Figure 9 is a lplan View of one of the safety-plates used in the lock.

Figure l0 is an end vie7 of the same.

is a sectionon the line t--t of *Y Figure ll is a viewof the' othersafety Figure l5 is a plan View of a form'of Y the safety plate.

Figure 16 is a side edge elevation of Figure l5.

In the Ydrawings the lock A is provided with a casing B in which thelock bolt C is adaptedtooperate. The locking bolt C is controlled by aseries of lever tumblers l0 which are held by the springs l1 ina mannerto normally hold the bolt C in locked. position. The bolt C cannot beunlocked and turnedA to Withdraw the same into the housing B of the lockA until the proper keysare inserted through the key revolving plugs orkey cylir ers l2 and 13. This lock is ef the lever tu .hier type and isthe de lil sign ol' look :is is ordinarily used in safety deposit horesin hahha and such places. These. types ol locks are made with a pair ofkey plugls which are adapted to revolve when the proper key is insertedtherein to release the lnerhanisni in the lock7 the piner or cylinderrotating` with the key to operY nte the look tulnhlers.

In eax-raving out my invention I provide safety plate nienlhers l5 and16 which are superiinfiosed in the loek lniusinpr B as illustrated inFigures l and l. The plete 1G is adapted to lie anainet the bottoni 17ot the houeingf li while the plate l5. which is oll :in anjgnilur crosssection. is siuierinuiosed above the plate lll and the side woll 18 otthe member il?) depends downwardly and engages l'reeljr efraim-:t thesurl'nce ol'v the hottoin lT. 7l`he side wall lil il: designated to reetagainst the side wall l5) oli the hciusine ll and the shrink 2li ot thepine; lll adapted to extend through the openine Q1 l'ornied in the plaieThis holds` the plate in place in the lock with its side woll finejninet the upwardly extendingl wall l) ol the hoursing: and with thelower edfre ol' the, wall 1S restinfr on the 'lure olE the bottoni 1T.

The openingr 2l in the plate lh is elongated to permit the plate toslide loneitiulinailly when the key is inserted in the plug;` lil i andengaged hy the key to operate the plete. .lo nornnllly hold the plate`with its edge E22 aeainet the side `-all 2? ol the housing* l provid"`a wire silirinp erin 2l, which is atleti-hed at by a srrew or othersuitable means to hold the wire spring' arin 2l in position, so that itwill eneaee againstthe sui-'hire ot the shank Q0 oit the pine 1?). 'lhisholds the plaie inelnher 15 normally out ol' operating position with itsedpje 22 npziinfwl' the side wall ll olE the lock A..

'Vlie plate l5 is formed with a hook 2li by elainpingr out the nmlferiulnhieh is ol a particular shape. bovine' a recess QT. The hook ill isadapted to ene'ueje lhe wire loop L??? i'orxned on the plug); lL so thatin normal position the loop Ln is engaged in the reieee LT in :l mannerso that when the member lo is in the position illustrated in Figure 2with its' eline 2:2 against the wal! 2l the i-ylinder or plug; l cannotbe rotated lo operate the look A.

'-lhe plete lll is similar lo lhe plate l5 in outline. exreplingl (hatit` does not have the depeniliiur wall irl. and it is provided with :icylinder opening E29 which is siniilnr lo the opening; 2l, while thelieviV operating openingr Till entends llroni the opening Eil.

hook Ill similar lo the hook QG is lormed on the end oll the plaie lliand a recess fll ronloriniiur with the reeeee 2T ie also in that thearin 83 entends in the recese 32 and nement permits the hook 3l to holdthe cylinder or plug 12 from turning even though the plate 15 might havebeen operated to a position to disengag'e the hook 2G troni the loop Q8.This plate 16 is directly below the plate and is at complementalJneinber adapted to cooperate with the saine when the, proper key isused so that the plates 15 and 1G operate together in a manner torelease the loop 28 and the arm 33 so that when the proper key is.inserted in the key slot El oli the plugr 12 the saine ean be rotatedand the tumbler levers 1() operated to operate the bolt C ol theloek A.i

In operation the bank is adapted to insert their key in the key slot inthe plug ll and this key is formed with the proper notches so as tooperatethe safety plates 15 and 1G to move the saine longitudinally sothat the hooks 2G and 31 disengage the loop E28 and the arm 33. If thebenk has the proper key the two safety plates 15 and 1G will be readilyoperated, but unless the proper key is used it is practically impossibleto insert a pick or member into the key slot 35 and operate the tumblerlevers l0. Yf'hen the plates 1:7 and 1G are proporly operated the properkey can be inserted into the key slot 3%1 and this cylinder or plug 12is 'ree to rotate in a manner to perinit engagement of the tumblerlevers to operate the sanne and operate the bolt C of the lock.

The plates 15 and 16` are stamped out ot' sheet materiel and are of aninexpensive construction7 while the loop 28 and the erin 33 are the onlyadditional elements to the lock to provide a safety which prevents aknife blade to be inserted through the key slot 35 to operate the levertongues 3G, which arel formed integral with a pair ol. the levertuniblers. lfleretotore these looks of this design lleve been madewithout any means ot providing;r a. safety such as l have illustratechand thus by inserting* the blzule oI a knife or other suitable lock pickinstruments the lever ends 3G could be engaged and operated and thus theeyliruler l--l could operate lo work the bolt (l ot the lock A. Myinvention is designed to overcome this dilieulty in :1A simpleinexpensive manner and lo provide a pair of plete members which mustoperate in unison and which it is practically impossible to operateunless the proper key is used with the notches Il'orined therein tocontorni with the por-1ition ol;- the recess lll and the key reeese`2157. The hook engagements oli' the plates l5 and 1G are independent ofeachother and thus even though the one plate may be operated it is notpossible to operate the plug l2 unless the other plate .is operated,thus providing a safety for the double plug lock A.

A simple, yet eective, safety device is illustrated in Figures 5 and 6of my drawlill) lll) ings in Which I illustrate a safety ineinberD,V Ywhich is channel shaped and is provided Wit-h an upper plate 36v and abottom plate 39 positioned directly below. the plate 66, While the frontplate Zl() rests against the front or side 19 of the lock liousing l.This safety meunier D is .provided With plug' openings al1 in the upperand lower plates 38 and 39 and extending from these openingsl are thekey recesses 12 and a3 which are of an voppositely positi ned nature inrelation to each other and are of a different shape so that the plug 13cannot be rotated unless a: key conforming with these notches andopenings is inserted into the lkey slot fof the plug .1i-3. This safetyfunctions siniilarvto the yplates 15 and 16, yet the membersl 38 and89am connected together by the side L16 and are opeiated toaether.rl-his form of device is not preferable as the plates 15 and 16, yet itis operable to form a safety for the lock of very simple nature,`so thatit cannot be easily picked and is not operable with an ordinary knifeblade.

In making `my device I can make the cylinder 12, Which receives the keyin the key slot 34, with the Wire loop 50 which operates similar to theloops 28 and 63 excepting that` the loop 50-is made in single piece andotherwise the cylinder 12 illustrated in Figure 14 is of the saineconstruction as that illustrated in Figure 7, having the same function.The Wire 50 engages in the hook portions 32 and 27A of the plates 15 and16.

In making the cylinder 12 with the single Wire loop 50 itis preferableto forni the plate 16 as illust-rated in Figures 15 and 16, with 'anoffset portion 51., which sets the hook recess 32 with the hook end 31up above the base. 17 of the housing of the lock A. This permits thefree' connection of the recess 32 of the hook end 31 with the loop 50.VHowever, the plate 16 illustrated in Figures 15 and 16 operates in theself same manner as the plate 16 in. Figures 9 and 10. Iradd the Wirespring member 24: on the member 16 in Figures 15 and 16 to assist inholdingl the plate 16 inone direction in relation to the connectingparts in the same manner as tlie'spring arm 24- holds the plate 15 inoperation.

In accordance with the patent statutes I have described the principlesof operation of my invention, together with the best enibodimentthereof, but I desire to'haveit understood that these illustrations anddrawings are only suggestive and that this invention can be carried outby other means and applied to uses yotherthan those above set forthWithin the scope of the following claims:

I claim:v y

LA lock including a pair of key plugs,

Vhaving lever tuinblers operableby keys adapted to means associatedWithsaid plugs iii a .inannerto b operated in unisony tov release` thekey vplug for Vthe` individual and a key vfor opera. i the same byreleasing the safety' means from said plug by the bank pass keyi.V

2. ii lock of thelever tumbler type including a series of levertumblers, a pair of key plugs associated with vsaid lever tuinblers iiia manner so that one of saidY plugs must be operated before theother-can operate.A and means comprising super-imposed plate inembershaving key slotsformed thereinlivhich require a key made to lit saitslots so that said plate `members can operate in' unisonzto release theplug which is adapted to ope-rate the lever tumblers and bolt of saidlock,

3. A lock of the lever tumbler type, a key plug for operating themajority of the lever tuinblers of said lock and thebolt of the same, asecond key plug adapted to formk the releasing means to permit saidfirst key plug to be operated When the proper key is inserted thereinand super-imposed plate means associated With said second key plug, keyslots ofa different formation formed therein, whereby said second keyplug can only be operated by a key designed to lit the recesses in saidsuper-imposed platek means, n

4.' A lock of the double key plug type, having a series of levertumblers, said tuin- Vblers being operable by keys and plate safe-` tymeans associated with key plugs in'a inann'er so that when one of saidplugs operates said ,plate inea-iis when the proper key is usedthereinthe otherofsaid plugs is released so that it may be operatedbytheproper key to litsaid lever tumbler meinbers.

5. A lock including a pair of key plugs, one of said plugs forming areleasing means to permit the other of said plugs to be operatedv` apair of plate members carried by said releasing plug, hook membersformed on the end of said plates, loop means formed on the other of saidplugs to be engaged by said hook members to hold said second plug fromoperation until said first plug has been operated by the proper key tofit said plate members, said plate members being independent of eachother and having key slots means adapted to hold said plate member inone position on said plug, u. second plete member posilioned below saidlirst plete member carried by said key plug, e similur hook ineensformed on seid second plete member, llie hook Ineens of both of seidplate members beingr adapted to engage menne 'formed on said second keyplugr niember, whereby when seid safety plete me1nbers are operated bythe proper key in the first plulbT seid Second plug is released eo thatit con be rotated to operate said lock.

7. A safety for :L lock huving u pair oil key plugs, includingsuperhnpoeed plutes havingT hooks iliormed on one end l'hereol, one ofseid plugs ol- Suid lock adopted lo extend through seid plees, the otherof seid plugs carrying members adapted to engage with Suid hooks to lookil' from operation, whereby when the key inserted .in the plug4euri-ying sold plulee, und operated, seid plates :ire movedlongitudinally to unlock the hooks from seid Second plug lo permitI thesinne to be operated to operute seid leek.

8. A sofletly menne `lor o key operated loek comprieinp` n` poil' ol keyplugs in Suid look, super-imposed plolte members udnpted to be operuledthrough one ol Suid plug members :mld plete members having' dilellont;key slots tliereln whereby the pluto niember4 een be operated only by u,key designed to lit sold keyY slote i). A. loll; olE the lever tumblertype Comprising' :1 puh? olI key plugs therein, safety menneV connectedlo suill key plugs und menne euri-led by mid safety ineens preventingr(he opel-:Lilou ol one o'l" Suid key plugs until Suid eul'ely moons hasbeen opemted.`

C-LAl S DIETRICH.

